Question

# Force $$F$$ is applied on upper pulley. If $$F = 30t$$ where $$t$$ is the time in second. Find the time when $$m_1$$ loses contact with the floor.

A
2sec
B
4sec
C
6sec
D
8sec

Solution

## The correct option is A $$2 sec$$Here, $$2T=m_1g=4(10)=40 \Rightarrow T=20 N$$and $$F=T+T+T=30t$$$$\displaystyle t=\frac{3T}{30}=\frac{3(20)}{30}=2 sec$$Physics

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